EP3596786B1 - Strain relief, end fixing part with strain relief and associated clamping part - Google Patents

Description

The invention relates to a clamping part for a clamping device of a strain relief for supply lines of a supply line device, in particular an energy transmission chain, the strain relief being designed for feeding through the supply lines in a longitudinal direction perpendicular or approximately perpendicular to the clamping direction, the clamping part being block-like and having a side surface designed as a clamping surface for Having clamping the supply lines against another clamping surface of the clamping device. The invention also relates to an end fitting having a strain relief.

Such strain reliefs are generally used to fix movable lines, e.g.

A corresponding strain relief is in the catalog of Applicant "igus catalog e-chains and systems 2015", page 1175 , disclosed, wherein the strain relief schematically in FIG. 1 reproduced in this application. The strain relief has several generic clamping parts between which the supply lines are clamped. In the clamping surfaces of the clamping parts, receptacles in the form of receiving grooves are incorporated, each of which is elaborately adapted to a very specific supply line. The supply lines must be inserted individually and one after the other into the receiving channel provided for them. Disadvantages are the complex special production, which is caused by a necessary adaptation of the clamping parts of the strain relief to the supply lines desired by the customer, and also the suitable installation of the supply lines in the strain relief.

Furthermore is off DE 203 05 479 U1 a strain relief with a strain relief element is known, to which the supply lines are fixed, for example, using cable ties.

In DE 20 2009 005 647 U1 discloses a strain relief for several supply lines, the same being individually fixed in position in the strain relief using clip clamps and press jaws.

Further strain reliefs, especially for cable carriers, are out DE 2006 007 155 U1 and DE 2014 008 413 U1 famous. Both propose elements or bases made of a flexible material, eg Vulkollan, foam or foam rubber, as clamping parts. These clamping parts have a monolithic plate-like construction - similar to that in the above catalog - and may also have semi-cylindrical recesses for the cables to be accommodated on a clamping surface, which are custom-made to match the cable cross-section (cf. FIG. 1 ). These solutions are also only suitable to a limited extent or with particular effort for supply lines that vary in terms of diameter and/or number.

For better adaptation to the number and different diameters of the lines, in DE 24 17 353 proposed to use an elastically deformable clamping lip made of foam, which has a special cross-sectional profile, for example an Ω profile, perpendicular to the direction of strain relief.

DE 78 18 648 U1 describes a cable holder with strain relief that includes clamps with a spring element, wherein the spring element presses the clamping surface of the clamp against the cable. The spring element after DE 78 18 648 U1 is designed as an elastic ring body.

One object of the invention is to provide a generic clamping part for a strain relief or an end attachment part with the strain relief, which can be produced with less effort and can be used more universally with regard to the supply lines to be fixed.

The stated object is achieved according to the invention by the features of claim 1. Advantageous developments are described in the dependent claims.

The stated object is already achieved in that the clamping surface is formed by an elastic wall at least in a clamping section provided for clamping the supply lines, the elastic wall delimiting a cavity structure on the side facing away from the clamping surface extends through the clamping part, in particular in or approximately in the longitudinal direction.

Since the elastic wall with the clamping surface delimits the cavity structure extending through the clamping part, the elastic wall can be pressed into a cavity when the supply line or supply lines are clamped. In cooperation with the cavity structure, the elastic wall produces a sufficient clamping effect.

The elastic wall with the clamping surface forms an outer wall of the clamping part. The cavity structure can be formed in particular by a number of inner walls. The cavity structure can, for example, comprise channel-like continuous openings and/or be shaped like a honeycomb structure.

The elastic outer wall can be designed to be elastically expandable into the cavity structure in order to clamp the supply lines against the clamping direction. When the supply lines are pinched, they press the elastically expandable outer wall into the, for example, channel-like free spaces of the cavity structure. As a result, a defined restoring force acting on the supply lines can be generated, which is designed to keep the supply lines stationary in the strain relief. The wall thickness of the outer wall and/or the inner walls of the cavity structure is preferably dimensioned such that the restoring force generates a contact pressure on the supply lines that is large enough to hold the supply lines in place in the strain relief without damaging the supply lines, in particular with regard to their functionality affect.

By deforming the elastic wall with the clamping surface, a receiving space for the supply line can be formed when it is clamped, which space nestles or adapts to the supply line. This receiving space is delimited against the clamping direction by the elastic outer wall pressed into the cavity. In particular, the elastic due to the elastic deformation of the wall with the clamping surface adapts to the same or the same during the fixing of the supply line or supply lines. In this way, supply lines of different diameters can be clamped without subsequent processing of the clamping part taking place. The strain relief is thus in terms of Cable diameters can be used universally over a wide range of diameters. The supply line or supply lines do not have to be easy to install, as in the closest prior art ( FIG.1 ), must be used at a specific point on the clamping surface that has been specially adapted to the respective supply line. It is therefore also not necessary to adapt or manufacture the clamping part depending on the assembly plan.

Mechanical properties of the clamping part, such as resilience of the clamping surface and of the clamping part itself, and support of the clamping surface can be adjusted in a targeted manner via the design or geometric design of the cavity structure. The strain relief can therefore also be used in a targeted manner with regard to the supply lines to be specified in a variety of ways with a view to an application-dependent grouping of supply lines to be specified.

An elastic deformation preferably takes place in the form of an expansion and/or compression of the flexible wall in such a way that the wall at least partially lies flat against the outer contour of the supply lines. In this way, the static friction between the supply line or lines and the wall can be increased, and the coupling of the elastic restoring force into the supply line can be improved. In this respect, the elastic wall can be described as a flexible wall, in particular also as a flexibly expandable and/or flexibly compressible wall.

In a clamped position, the supply line(s) is/are clamped over a longitudinal section and pressed against a further clamping surface of the clamping device. The further clamping surface can form a counter-clamping surface or, in general, an abutment to the wall or side surface of the block-like clamping part designed as a clamping surface.

However, the further clamping surface can in particular be an elastic wall on the outside of a further clamping part of the same construction with the cavity structure according to the invention.

In particular, the elastic restoring force and thus the clamping force can be adjusted in a targeted manner during production. This can be done, for example, via the formation of the cavity structure and/or via the formation of the elastic wall, in particular via its wall thickness and/or flexibility. With that she can Strain relief can be easily customized, for example, for certain types and sizes of supply line. On the other hand, the strain relief can be configured in particular via the design of the cavity structure in such a way that it can be used universally for a large number of different diameters of supply lines. The desired flexibility, in particular elasticity, in connection with suitable static friction can also be achieved, among other things, by selecting suitable materials. Thermoplastic elastomers are particularly preferred.

The cavity structure extends like a channel through the entire clamping part. Channel-like means here that the cavity structure has several to a large number of channels, which are each open to the outside on both sides in the longitudinal direction, but are preferably completely closed to the outside at the side, i.e. transverse to the longitudinal direction. In particular, the channels can be arranged parallel to one another and running in the longitudinal direction. The longitudinal direction refers to the longitudinal direction of the cables to be clamped.

According to the invention, the cavity structure is defined by a plurality of through openings running in the longitudinal direction, at least some of which are delimited by the elastic wall with the clamping surface. In this case, this wall can be supported or specifically stiffened against the clamping direction by further inner walls which form the through-openings.

With the clamping of the supply lines between the clamping surfaces in the clamping direction, the elastic wall is pressed against the clamping direction into the cavity structure, as a result of which, among other things, it and also the cavity structure are correspondingly elastically deformed. Thus, for example, a type of spring system with the outer wall, similar to a leaf spring fixed on both sides, can be provided which, in the operating position, exerts an elastic restoring force on the supply line or supply lines, through the clamping of which it was expanded. As shown in more detail below, this can be used to specifically determine restoring forces via design measures such as the number, arrangement and design of the through openings or inner walls or wall thickness of the wall(s) and/or material-related measures such as elasticity of the wall are preset and the suitability of the strain relief can be made possible, for example, for different diameters of supply lines, different types of supply lines and/or for supply lines with different cross-sections.

The through openings preferably have a constant cross section over their entire length. In particular, the clamping surface can be formed by the wall of adjoining through-openings or with inner walls lying between them. Furthermore, in the unloaded state, the clamping surface can be designed at least essentially without a curvature.

The through-openings can preferably be arranged directly adjacent to one another via elastic walls, i.e. the through-openings are delimited by further inner walls. In this way, the elastic deformation of a through-opening can be partially transferred to adjacent through-openings, in that the inner elastic walls via which adjacent through-openings adjoin one another are also elastically deformed.

Advantageously, at least the majority of the clamping surface or the entire clamping surface can be formed by the wall of adjoining through-openings, i.e. a continuous outer wall delimits a number of through-openings on the line side to the outside. In this way, the entire clamping surface can be specifically preset over its lateral extent, in particular with regard to its elastic widening.

In terms of manufacturing technology, the wall thickness of the wall forming at least the clamping section of the clamping surface and the wall thickness of the walls via which the through-openings adjoin one another, i.e. the inner walls, can be at least approximately or exactly the same size.

In particular, the wall thickness of the elastic wall can be designed to be smaller, in particular several times smaller, than an average diameter of the through-openings.

In a further development of the strain relief, the wall thickness of the elastic wall or elastic walls can be less than/equal to one third of the average diameter, less than/equal to be one eighth of the average diameter or less than/equal to one tenth of each average diameter of the adjacent through holes.

The mean diameter refers to the cross section of a specific through hole. A mean diameter can be determined from the mean value of several diameters of different orientations perpendicular to the longitudinal direction, with the diameters each passing through a centroid of the cross section, for example. The smaller the ratio of wall thickness to average diameter of the through-openings, the softer the spring system and clamping block are.

The through-openings assigned to the clamping surface can be configured congruently or at least similarly. In particular, the through-openings can have the same size, the same cross-section and/or the same orientation. The through-openings can thus form small unit cells that add to the deformation behavior. In particular, the passage openings can be formed by a grid of at least similar elastic walls extending in the longitudinal direction. Advantageously, the through-openings can run like channels in the longitudinal direction. The through openings can each have a constant cross section over the length or parallel to the longitudinal direction. In the lattice, the inner walls can be connected to each other and to the elastic outer wall having the clamping surface. In particular, the elastic walls can be connected to one another so that they run together at least approximately in the longitudinal direction. The connecting lines can be nodal lines of the grid, which appear as nodal points in the cross-section. At least the majority of the elastic walls of the at least one clamping part can have the same wall thickness.

The lattice structure of the walls can be honeycombed. The lattice structure of the walls is preferably regular, in particular uniform. The elastic wall having the clamping surface can thus have the same or at least similar deformation behavior over its lateral extension transversely to the longitudinal direction. This favors a universal use of the strain relief with regard to the supply lines. On the basis of the lattice structure, the deformation behavior can be easier be calculated and planned. This makes it easier to automate the different steps, e.g. in an additive manufacturing process, such as configuring and assembling the strain relief with the supply lines.

In a development of the strain relief, in particular with a uniform cavity or lattice structure, the through-openings can each have the shape of a right prism with a polygonal base area made up of preferably the same sides. Alternatively, the through-openings can each have the shape of a straight cylinder with a round base, in particular as a part-cylinder with a closed round or semi-circle in terms of cross section. The straight cylinder can be a circular cylinder, a cylinder with an oval base or, for example, a cylinder with an oblong base. It goes without saying that the through-openings do not necessarily all have to be of the same design. However, also because of the more uniform force transmission and deformation, it has proven to be advantageous to arrange the through-openings regularly or in a specific "pattern" in which they and/or any "empties", i.e. places without a through-opening, have at least a similar cross-section exhibit.

In one embodiment of the strain relief, the cross-section of the through-openings can have the shape of a right prism with a triangular base area. Due to the geometry, such a right prism with a triangular base has a wedge shape with linear apex edges, which each form a vertex of the triangle in the triangular base. This wedge shape is particularly favorable for the transmission of forces and counteracts undesirable twisting of the clamping part, for example as a result of an asymmetrical distribution of the supply lines in the strain relief.

In particular, the triangle of the base area can be arranged with a point pointing in the opposite direction to the clamping direction in one group of through-openings and in the clamping direction in another group. Advantageously, the through-openings of one group can be arranged in a transverse direction perpendicular to the longitudinal direction and clamping direction, alternating with the through-openings of the other group and in a row with respect to the transverse direction.

In particular, the through-openings can be arranged in alignment with one another in the transverse direction.

If, as described above, the through-openings adjoin one another, they can, with their elastic walls, form a uniform elastic lattice of force-mechanically stable, e.g. triangular lattice units, in which deformation forces are passed on. In particular when the triangle is equilateral, the distribution of forces and the course of deformation in the elastic lattice can be at least roughly estimated, for example using the finite element method, and can therefore be predetermined more easily. This can also affect the elastic wall with the clamping surface.

In particular, the through-openings of the group with the tip pointing in the opposite direction to the clamping direction can be delimited by the elastic wall with the clamping surface or a corresponding section of this clamping surface.

The consequence of this is that the inner walls of the through-openings of both groups act on the elastic wall with the clamping surface. In this case, the through-openings with the linear apex edge pointing in the opposite direction to the clamping direction are delimited by the elastic wall with the clamping surface on their side face opposite the apex edge. Furthermore, the inner walls of the through openings with the linear apex edge pointing in the clamping direction engage with this apex edge on the elastic wall with the clamping surface. The clamping surface can thus be supported linearly at these points and stiffened or reinforced here.

The arrangement of the through openings or inner walls aligned in the transverse direction implies that the through openings with the apex edge pointing in the clamping direction can form an elastic wall extending in the transverse direction and longitudinal direction on their side surface opposite this apex edge. The through-openings can then act on this wall with their apex edge pointing counter to the clamping direction, as a result of which it can be stabilized and stiffened. To form this elastic wall, the lattice structure can be made of elastic walls against the clamping direction via the arrangement of the through-openings aligned to the transverse direction be continued. The lattice structure is preferably continued unchanged. In particular, the lattice structure of a clamping part is uniform, preferably uniform in cross section perpendicular to the longitudinal direction.

The sections of the elastic wall of the clamping surface, which are respectively between the locations at which the through-openings of the group with the apex edge pointing in the clamping direction are linearly connected to the elastic wall, can be designed to curve against the clamping direction, forming a receiving groove. The receiving groove can be used as a guide for correct and evenly distributed insertion of the supply lines into the strain relief. For this purpose, the receiving grooves are preferably distributed uniformly transversely to the longitudinal direction.

In particular, the base area of the wedge-shaped passage openings can each have an internal angle of less than 60°, in particular less than/equal to 45° or less than/equal to 30°. The sides or inner walls delimiting this inner angle can preferably be of isosceles design. This gives the through-opening a slimmer, wedge-like shape, with the isosceles sides converging to form the apex edge, which in cross-section forms the tip pointing in or against the clamping direction. The walls forming the apex edge thus extend more in the clamping direction than in the case of an equilateral triangular base area. As a result, the cavity structure can be further stabilized with regard to the absorption of forces, which counteracts an undesired breaking out of the cavity structure in the transverse direction.

It has proven to be advantageous if the inner walls of the through-openings, which extend with a main component in the clamping direction, are designed to be guided in an arc. As a result, the bending of the through-openings during the deformation can be predetermined. Furthermore, the spring system can be expanded by another elastic spring component via the bend. Because of the symmetry of forces, it is advantageous if these elastic walls are designed to be curved in opposite directions with respect to the transverse direction in pairs.

In a further development, the through-openings can be arranged in a honeycomb manner in at least two mutually parallel rows. One row or both rows can define the clamping surface. The rows can extend in a honeycomb manner perpendicular to the longitudinal direction and clamping direction with respect to a transverse direction. Honeycomb means here in particular that the through-openings of one row at least partially overlap with those of the other row with respect to the transverse direction and/or the clamping direction. The passage openings of the respective row can also be arranged in alignment with one another with respect to the transverse direction and/or clamping direction. A honeycomb structure with a periodic, regular or uniform arrangement of the through openings can be provided, but not necessarily, for example, with a hexagonal basic shape.

Particularly in a honeycomb arrangement of through-openings with a hexagonal base area, a clamping surface with receiving grooves can be formed as a result of one row projecting beyond the other row in the clamping direction. Correspondingly, with a honeycomb-like arrangement of through-openings, each with a rhombic base, V-shaped receiving grooves can be formed, which are each delimited by two through-openings.

The through-openings assigned to the clamping surface are preferably arranged in a volume section of the block-like clamping part. The volume section can be defined by the clamping surface and at least a section of an overall height of the clamping part starting from and perpendicular to the clamping surface. In particular, at least some of the through-openings of the other row can in each case act laterally in a linear manner on the clamping surface between two through-openings of one row.

In general, when the supply lines are clamped between the clamping surfaces, the strain relief can be exposed to increased tensile forces acting in the longitudinal direction during operation. Depending on the type and/or distribution of the supply lines, these can also have an asymmetrical effect on the strain relief. There is thus a risk of the clamping parts twisting about the longitudinal axis and bending about a bending axis parallel to the clamping direction and/or about a bending axis parallel to the transverse direction. In order to counteract this, reinforcements can be provided at certain points and areas of the clamping part, in particular by means of at least one further inner wall. Through these stiffeners, a targeted Reduced elasticity can be adjusted. The spring system described at the outset can thus be designed to be resiliently harder.

For this purpose it can be provided that a stiffening of certain passage openings with a wall dividing them in the longitudinal direction, for example in the form of an inner strut dividing the cross section. The stiffening can take place by means of a reinforcement of the wall delimiting it, a reduction of the cross-sectional area and/or by omitting passage openings.

In particular, it can be provided that a cross brace extending over the length of the clamping part and in the transverse direction is provided in a middle region with respect to the longitudinal direction. This cross brace can have a plate-like shape, which opposes a bending about the bending axis parallel to the clamping direction with an increased moment of resistance.

More preferably, with respect to the transverse direction perpendicular to the longitudinal direction and clamping direction, a cross brace extending over the length of the clamping part and in the clamping direction can be provided in a middle and/or end region. This cross brace can also have a plate-like shape, which opposes a bending about the bending axis parallel to the transverse direction with an increased moment of resistance. Furthermore, the transition of the spring-elastic system to the intended holding areas of the clamping part for holding and fixing the same in the clamping device is mitigated by this cross-bracing with regard to the force curve, reducing wear.

The wall thickness of the cross brace can in particular be greater than the wall thickness of the outer wall with the clamping surface and/or the inner walls.

In a preferred embodiment, the clamping part is mirror-symmetrical with respect to a main plane, which is perpendicular to the longitudinal direction and clamping direction, with two lateral, elastic walls which are delimited by a symmetrical cavity structure and provide clamping surfaces. The cross brace mentioned above can lie in the plane of symmetry or form it as a kind of center brace.

In a further development of the strain relief, the clamping surface can have at least one or more receiving grooves for receiving supply lines, in particular with a larger cross section. The cross section of the receiving grooves can preferably be defined solely by the through-openings adjoining the respective receiving groove. In contrast to the receiving grooves described above, the receiving grooves each have a depth that is up to a multiple of the average diameter of the through-opening that delimits them.

These additional receiving grooves are each inserted from the clamping surface without cutting the adjoining passage openings. Advantageously because of a possible jamming of the supply line inserted in the receiving channel and thus spring-elastic tensioning of the passage opening adjacent to the receiving channel, the receiving channels can be constructed in a wedge shape converging against the clamping direction. This is possible with through openings, for example, with a triangular or rhombic base area.

In particular, the clamping part can have a further clamping surface which faces away and is arranged parallel to the one clamping surface of the clamping part on the same. The two clamping surfaces can be of the same design for ease of assembly. A simple embodiment in this respect is, for example, mirror-symmetrical to the main plane of the clamping part.

A group of preferably identical through-openings can be assigned to each clamping surface. For this purpose, the group of one clamping surface can be arranged in relation to the clamping direction indirectly via a region without through-openings or directly adjoining the through-openings assigned to the further clamping surface. The area without through-openings forms a cross brace, already described above, which increases the torsional strength or generally stiffens the clamping part. This cross brace is preferably arranged in a center break or exactly in the middle.

If the two groups are connected directly, they can preferably merge into one another in an indistinguishable manner, ie without disturbing a uniform or regular opening structure.

The clamping part is preferably designed in one piece and in particular is made entirely of one material. An elastic plastic is preferred as the material, in particular a non-porous thermoplastic elastomer. The clamping part can be produced, for example, by injection molding or in an additive process. Production by injection molding is preferred.

Without wishing to limit it to this, the clamping device can, for example, have a mounting frame known per se, in which the clamping part or parts alone is/are mounted so that it can be displaced in the clamping direction and can be pressed in the clamping direction.

In particular, a device according to FIG DE 20 2017 102 147 under consideration.

In a further development, the strain relief can have at least one further clamping part, the two clamping parts being arranged in the installation position in the strain relief with their clamping surfaces lying opposite one another and being able to be pressed against one another. The two clamping parts are preferably of identical construction. Typically, several clamping parts are used, with the clamping parts not necessarily but preferably being designed as identical parts, which simplifies assembly and storage. The lines are then clamped in several levels, each between two opposite clamping parts.

As is known from the prior art mentioned at the beginning, the clamping part or the clamping parts can each have a holding area on both sides with respect to the transverse direction for holding and guiding it in the receiving frame provided in the clamping device and between these a clamping area with the clamping surface exhibit.

With regard to a stable seat of the clamping parts in the receiving frame, the clamping parts can be connected to one another in the clamping direction, in particular via a plug-in connection. For this purpose, the clamping part can have a plug-in projection in both holding areas on the side with the clamping surface, which extends in the clamping direction in the installed position, and on the side facing away from this, an plug-in opening correspondingly adapted to the plug-in projection, which is embedded in the clamping direction in the respectively assigned holding area is. The plug-in projection and, adapted thereto, the plug-in opening are preferably designed to taper conically in the clamping direction. According to the invention, an end attachment part of a line guiding device or energy guiding chain can be equipped with a strain relief according to one of the embodiments described above and below. Here, the strain relief can be arranged perpendicular to the longitudinal extent of the end attachment part and thus perpendicular to the longitudinal extent of the energy guiding chain with respect to its extension in the transverse direction and in the clamping direction.

A number of clamping parts are preferably held in a frame. The clamping parts are preferably installed vertically, ie in an orientation with the clamping surfaces running substantially vertically. This has the advantage that all lines can be made more easily accessible, for example for maintenance purposes, than in a horizontal stack (cf. FIG.1 ).

In particular, for connection to the supply line, the end fastening part can have a connection connection in the usual way, which is adapted to the supply line device to be connected, in particular to a line guiding device or energy guiding chain. Without wishing to be limited to this, since a large number of other constructive solutions are also possible, the connection terminal can have, for example, two side parts which are spaced apart from one another in the transverse direction.

In the case of a power transmission chain, i.e. a supply line device consisting of pivotable chain links with side plates, it can be provided that the side parts are designed as connection side plates adapted to the side plates, to which the chain link to be connected to the end attachment part can be pivotably connected with its side plates.

The proposed strain relief is particularly well suited for use in energy chains, in which quite typically various cables with different diameters are routed.

The clamping part is preferably made in one piece elastic plastic, in particular made of a TPE in the injection molding process, and has two opposite side surfaces, each comprising a clamping surface for clamping at least one supply line against a further clamping surface for the purpose of strain relief.

According to the invention, an elastic wall is provided at least in the area of the clamping surface intended for clamping the supply lines, which delimits a cavity structure on the side facing away from the clamping surface, this cavity structure being formed by a grid-like arrangement of a number of further elastic walls which are connected to the first elastic wall Wall are connected in one piece.

The clamping part is preferably designed to be mirror-symmetrical with respect to a main plane perpendicular to the clamping direction, so that the rotational orientation during assembly is not important.

In the main plane, the clamping part preferably has a cross brace which extends over a main dimension and is connected in one piece to the grid-like arrangement of the walls.

In an embodiment that is easy to produce by injection molding, the cavity structure has a plurality of through-openings running in the longitudinal direction, which extend at least predominantly or completely continuously in or approximately in the longitudinal direction through the clamping part. A predominantly continuous extension goes through at least 50% of the dimension of the clamping part in the longitudinal direction. The cavity structure is preferably honeycomb-like, i.e. the elastic walls form cell walls which delimit the through-openings perpendicular to the longitudinal direction.

In an embodiment that is favorable in terms of force distribution, the lattice-like arrangement has walls arranged in pairs, with opposing walls in each pair being bent in opposite directions. These can taper inwards, ie delimited intermediate passage openings, which have a cross-sectional shape that tapers against the clamping direction or away from the elastic wall with the clamping surface. The walls in each pair preferably transition in one piece into the cross brace at the end region facing away from the clamping surface.

At least one projection and/or depression can be provided on two opposite narrow sides of the clamping part, which are perpendicular to the side surfaces DE 20 2017 102 147 serves. The projection and/or the depression can run in the clamping direction or transversely to the longitudinal direction.

The clamping parts according to the invention are particularly suitable for use in a strain relief with multiple supply lines, in particular in a strain relief for a power transmission chain, or in a strain relief in the housing of a connector, particularly a rectangular connector with multiple plug inserts.

• FIG. 1 eine Seitenansicht einer im Stand der Technik bekannte Zugentlastung mit mehreren übereinander gestapelten Klemmteilen,
• FIG. 2a eine Seitenansicht einer Ausführungsform einer erfindungsgemäßen Zugentlastung mit mehreren Klemmteilen,
• FIG. 2b und 2c jeweils eine Ansicht eines Endbefestigungsteil mit der erfindungsgemäßen Zugentlastung gemäß Figur 2a,
• FIG. 3a eine Seitenansicht einer weiteren Ausführungsform des Klemmteils.
• FIG. 3b und 3c jeweils eine Seitenansicht zweier übereinander gestapelter Klemmteile gemäß Figur 3a ohne eingeklemmte Versorgungsleitungen bzw. mit eingeklemmten Versorgungsleitungen,
• FIG. 4a-4d jeweils eine Ansicht einer weiteren Ausführungsform des Klemmteils,
• FIG. 5a-5d jeweils eine Ansicht einer weiteren Ausführungsform des Klemmteils,
• FIG. 6a-6d jeweils eine Ansicht einer weiteren Ausführungsform des Klemmteils,
• FIG. 7a-7d jeweils eine Ansicht einer weiteren Ausführungsform des Klemmteils,
• FIG. 8a eine Seitenansicht einer weiteren Ausführungsform des Klemmteils,
• FIG. 8b und 8c jeweils eine Ansicht zweier übereinander gestapelter Klemmteile gemäß Figur 8a ohne eingeklemmte Versorgungsleitungen,
• FIG. 9a-9c jeweils eine Ansicht einer weiteren Ausführungsform des Klemmteils,
• FIG. 10a und 10b jeweils eine Ansicht einer weiteren Ausführungsform des Klemmteils,
• FIG. 11 eine Seitenansicht einer weiteren Ausführungsform des Klemmteils,
• FIG. 12a und 12b eine besonders bevorzugte Ausführungsform eines erfindungsgemäßen Klemmteils, jeweils in Frontansicht und in perspektivischer Ansicht,
• FIG. 13 eine Frontansicht einer bevorzugten Zugentlastung für Energieführungsketten;
• FIG. 14 einen Längsschnitt eines Steckergehäuses eines industriellen Rechteck-Steckverbinders mit zwei erfindungsgemäßen Klemmteilen zwecks Zugentlastung.

Further details and advantages of the invention will become apparent below, without limiting the scope of protection, through the description of preferred embodiments with reference to the accompanying drawings. Here show:

• FIG. 1 a side view of a strain relief known in the prior art with several clamping parts stacked on top of each other,
• FIG. 2a a side view of an embodiment of a strain relief according to the invention with several clamping parts,
• FIG. 2b and 2c in each case a view of an end attachment part with the strain relief according to the invention Figure 2a ,
• FIG. 3a a side view of a further embodiment of the clamping part.
• FIG. 3b and 3c in each case a side view of two stacked clamping parts according to FIG Figure 3a without jammed supply lines or with jammed supply lines,
• FIG. 4a-4d each a view of a further embodiment of the clamping part,
• FIG. 5a-5d each a view of a further embodiment of the clamping part,
• FIG. 6a-6d each a view of a further embodiment of the clamping part,
• FIG. 7a-7d each a view of a further embodiment of the clamping part,
• FIG. 8a a side view of a further embodiment of the clamping part,
• FIG. 8b and 8c in each case a view of two stacked clamping parts according to FIG Figure 8a without pinched supply lines,
• FIG. 9a-9c each a view of a further embodiment of the clamping part,
• FIG. 10a and 10b each a view of a further embodiment of the clamping part,
• FIG. 11 a side view of a further embodiment of the clamping part,
• FIG. 12a and 12b a particularly preferred embodiment of a clamping part according to the invention, each in a front view and in a perspective view,
• FIG. 13 a front view of a preferred strain relief for energy guiding chains;
• FIG. 14 a longitudinal section of a connector housing of an industrial rectangular connector with two clamping parts according to the invention for strain relief.

FIG. 1 shows one from the catalog of Applicant "igus catalog e-chains and systems 2015", page 1175 , well-known and thus state-of-the-art strain relief 1" for example in FIG. 3c shown supply lines V a supply line device not shown here. FIG. 2 shows a corresponding view of the strain relief 1 according to the invention. The reference numbers for the components of the strain relief 1" according to the prior art additionally have a quotation mark to distinguish them from the strain relief according to the invention. The strain relief 1;1" has a clamping device 2;2" with five here block-like clamping part 3;3" stacked on top of each other. The clamping parts 3; 3" have at least one side surface designed as a clamping surface 31; 31" for clamping the supply lines V against a further clamping surface 31; 31" of the clamping device 2; 2". In this case, the strain relief 1;1" is used to feed through the supply lines in a longitudinal direction l designed perpendicular to the clamping direction k, with the longitudinal direction l in FIGS. 1 and 2 each is arranged perpendicular to the image plane. The clamping parts 3; 3" stacked on top of one another rest with their clamping surfaces 31; 31" pressed against one another in the clamping direction k. They are guided in a mounting frame 4;4" so that they can be displaced in the clamping direction k. The mounting frame 4;4" according to FIGS. 1 and 2a The upper transverse web 41; 41" can be pressed against the clamping parts 3; 3" in the clamping direction k via a connection (not shown here) in order to clamp the supply line V. However, the invention is not limited solely to this constructive possibility for fixing the clamping parts 3 in the strain relief 1.

In the prior art, the clamping part 3" is a compact solid body. Semicircular receiving grooves 32" are cut into the clamping surfaces 31" of the clamping part 3", which, in the installed position, communicate with the corresponding receiving grooves 32" of the associated clamping surface 31" of the adjacent clamping part 3". be supplemented to form a circular receptacle for each supply line.As can be clearly seen, such an annular receptacle is provided for each of the supply lines, with this being specifically adapted to the diameter of the associated supply line in each case.

In contrast, the invention provides that the clamping surface 31 is formed by an elastic wall 50, at least in a clamping section 33 provided for clamping the supply lines V, with the elastic wall 50 on the side facing away from the clamping surface 31 extending in the longitudinal direction l through the clamping part 3 extending cavity structure 6 is limited. This is exemplary in FIG. 3d , an enlarged detail FIG. 3a , Removable, wherein the longitudinal direction l is perpendicular to the plane of the drawing. As a result of this measure, the clamping surface 31 can be flexibly expanded into the cavity structure 6 when a supply line V is clamped, whereby it acts like a leaf spring clamped on both sides and stores spring energy with the expansion, which acts on the clamped supply line V in the form of a restoring force.

Like the FIGS. 2-11 can be removed, in the embodiments of the strain relief 1 according to the invention shown here, the cavity structure 6 is replaced by several to a large number of in Longitudinally l running through openings 61 are defined, of which at least some of the clamping surface 31 having elastic wall 50 are limited. Furthermore, the through-openings 61 adjoin one another via elastic inner walls 52 . These form a lattice of at least similar elastic walls 52 extending in the longitudinal direction l. The through-openings 61 are each designed like channels and have no change in cross section over the length of their extension (perpendicular to the plane of the drawing with respect to 3a-3c ). In this respect, the through openings 61 have a columnar or cylindrical or pillar-like or prismatic shape, depending on the respective opening cross section.

Thus, the through opening 61 of elastic walls 50, 52 are laterally limited. Since at least some of them, as part of the cavity structure 6, are also delimited by the elastic wall 50 having the clamping surface 31, the elastic walls 50, 52, i.e. the elastic wall 50 with the clamping surface 31 and the other elastic walls 52 delimiting the through-openings 61, form an elastic grid in which the individual elastic walls 50, 52 are connected to one another at certain points. This elastic grid of walls 50, 52 forms a spring system which is deformed in a targeted manner when supply lines V are clamped in and generates a restoring force on the respective supply line V for fixing the same between two clamping surfaces 31 of the clamping device 2. Thus, the supply lines V are frictionally fixed in the strain relief 1 and are held by static friction.

In the FIGS. 3a-3d This process is shown as an example on the clamping part 3 with a cavity structure 6, which has through-openings 61 each with a hexagonal cross-section, so that the through-opening 61 delimiting walls 50, 52 form the shape of a right hollow prism with a hexagonal base. The walls 50, 52 of the through openings 61 adjoin each other at the corners of the hexagons to create the elastic latticework.

FIG. 3a shows an individual representation of an embodiment of the clamping part 3. In FIG. 3b two clamping parts 3 are arranged opposite one another on the clamping surface 31 assigned to one another, without supply lines being clamped between the clamping surface 31 .

It is clearly visible that the adjoining through-openings 31 here form a continuous hexagonal structure. In FIG. 3c two supply lines V with different cross-sections are frictionally fixed between the clamping surfaces 31, the clamping surfaces 31 being elastically widened and the elastic walls 50, 52 being deformed between the passage openings 31. It is clearly visible that the deformation of the wall 50, which defines the clamping surface 31, is greatest and that the deformation of the inner walls 52 against the clamping direction k decreases significantly. The through openings 61 of the grids can thus be viewed as small unit cells that cumulatively contribute to the deformation behavior. The plate-shaped elastic walls 50, 52 are connected to one another in nodal lines 54 of the grid, which appear as nodal points in cross-section.

It is also clear that the elastic latticework of walls 50, 52 as a whole reacts to the deformation and thus forms a type of coherent deformation continuum. Among other things, a specific deformation behavior of the elastic grid can be preset via the shape. This can be done via the design and arrangement density of the through opening 31 per unit area, the wall thickness of the elastic walls 50, 52, the material-specific elasticity of the walls 50, 52 and, if necessary, the provision of areas without through openings to reinforce or stiffen the clamping part. In particular, a specific resiliently soft or hard behavior can be set. This presetting can be done in such a way that the strain relief 1 can be used in a variety of ways, and it can be designed to be suitable for a specific range of supply line cross sections and/or supply line types. The setting can also be made in such a way that the strain relief 1 is specified based on specific customer requirements.

Apart from FIG. 10b shown embodiments of the clamping part 3 the same size. The wall thickness of the elastic wall 50 or the elastic walls 52 is, for example, approximately less than one or equal to one sixth of the average diameter of the adjoining through-openings 61 defined above.

In addition, the through-opening 61, like the through-openings 61 of the cavity structure 6 of the strain relief 11 according to the FIGS. 4 and 7-10 , arranged in a honeycomb pattern. Honeycomb means here in particular that through-openings 61 partially overlap in the transverse direction q and in the vertical direction h. The height direction h is parallel to the clamping direction k. The through openings 61 run in parallel rows to the transverse direction q.

As a result of the overlap in the transverse direction q, receiving grooves 36 which are uniformly spaced apart in the transverse direction q are formed on the clamping surface 31 by the wall 50, which can serve as a guide or grid when inserting the supply lines V in the longitudinal direction l into the clamping device 2. The size of the opening cross section of the receiving grooves 36 is determined by the size of the hexagonal opening cross section of the through holes 61 . Here it has a cross-sectional shape of a bisected hexagon. The through-openings 61 assigned to the clamping surface 31 are congruent here or they have the same size, the same cross-section and the same orientation.

In general, the clamping parts 3 have a holding area 34 on both sides with respect to the transverse direction q for the non-rotatable and longitudinally displaceable arrangement in the in FIG. 2 shown receiving frame 4 of the clamping device 2 and arranged between the holding areas 34 terminal area 35 with the clamping surface 31 and the cavity structure 6.

The FIGS. 3a-3c a transverse strut 7 extending in the transverse direction q over the entire clamping area 35 in the form of a continuous transverse web 71. This extends in the form of a plate in the transverse direction q over the entire longitudinal extension of the clamping part 3 introduced through the supply lines V in the strain relief 1 tensile forces are better absorbed. The wall thickness of the cross brace 7 is approximately the same as that of the walls 50, 52.

The cross brace 7, like the walls 50, 52, can be designed to be elastic in order not to impair the elastic deformation behavior excessively. Since the cross brace 7, however, arranged centrally in the height direction h, divides the middle passage openings 61, here for example bisected, it also provides a stiffening of the Cavity structure 6 is and whereby the deformation of the elastic lattice of walls 50, 52 decreases accordingly at this point. Also in the embodiments of the strain relief according to FIGS. 5a-5d, 6a-6c , 8a-c , 9a-9c, 10a-10b and 11 ) is in each case a cross brace 7 either by a cross bar 71 ( FIGS. 5a-5d, 6a-6c , 8a-8c ) or through a central area free of through openings 61 ( FIGS. 10a and 11 ) intended. Such reinforcements can also have a targeted effect on the deformation behavior, in particular on the torsional stiffness, and correspondingly on the spring behavior of this elastic lattice.

In the embodiment of the strain relief 1 according to FIGS. 4d and 10 a changed deformation behavior is achieved in that a middle row of through-openings 71 is provided, which have a larger cross-section than the other through-openings 71, wherein they are in Figure 4d and thus are merely similar to the same. Furthermore, in FIG. 4d Pronounced thickenings 72 are provided between these central passage openings 71 for reinforcement with respect to the transverse direction q.

Another possibility for the arrangement and shape of the through-openings 61 is shown in FIG FIGS. 5a-5d and 6a-6d, respectively. Here, the through openings 61 have the shape of a right prism with a triangular base and delimit an elastic lattice. Like in particular FIG. 5d , a detail enlargement Vd from FIG. 5a , as can be seen, such a right prism with a triangular base has a wedge shape with linear apex edges 62 . This form is mechanically particularly favorable.

With regard to the clamping direction k, the through-openings 61 are arranged in different orientations: in one group of through-openings 61, the apex edge 62 points towards the clamping direction k, while the apex edge 62 in the other group 61 is arranged pointing towards the clamping direction k. The through-openings 61 of the two groups are arranged in alternation with respect to the transverse direction and aligned with one another.

Furthermore, the through-opening 61 of the group with the apex edge 62 pointing counter to the clamping direction k is delimited by the elastic wall 50 of the clamping surface 31 . This means that the side face 63 opposite the apex edge 62 is delimited by this elastic wall 50 . The apex edge 62 of the through openings 61 of another group acts on the elastic wall 50 of the clamping surface 31 . Thus, the clamping surface 31 is linearly supported at these points and thus stiffened. The through-openings 61 of both groups act on the elastic wall 50 having the clamping surface 31 .

The lattice structure of the walls 52 is continued against the clamping direction k to a further clamping surface 31 of the clamping part 3 in such a way that the through-openings 61 of both groups also form a transverse web 41 on a central elastic wall 52 parallel to the elastic wall 50 with the one Attack clamping surface 31. Furthermore, the lattice structure is repeated between the central clamping surface 31 and the further wall 52.

Between the points at which the clamping surface 31 engages over the apex edge 32 of the through-openings 61 of the other group 31, the clamping surface 31 is designed as a guide to the proper insertion of the supply lines, each forming a receiving groove 36 bent against the clamping direction k.

In a particularly preferred development according to the FIGS. 6a-6d the inner walls 52 of the through-openings 61, which extend with a main component in the clamping direction k, are of arcuate design. This results in how the FIGS. 6a-6d because of the symmetry of forces, these walls 52 are arranged in pairs with respect to the transverse direction q, with oppositely curved walls 52 being provided in each pair.

According to FIG. 5a-6a With respect to the transverse direction q, a plate-like cross brace 7 is provided on both sides, extending over the height h parallel to the clamping direction k and over the length l of the clamping part 3 . This cross brace 7 opposes a bending about the bending axis parallel to the transverse direction q with an increased moment of resistance.

In the FIGS. 7a-7d and 8a-8c are provided as a honeycomb-like cavity structure 6 adjoining through-openings 61 with a rhombic cross-section. Here, the size of the opening cross sections differs with respect to the FIGS. 7a and 7b considerably, the cavity structure 6 with larger rhombic through-openings 31 being designed to be spring-mechanically softer than that with smaller rhombic through-openings 31 . Likewise, as a result of the honeycomb-like arrangement of the through-openings 61 on the clamping surface 31 , V-shaped receiving grooves 36 are formed here, each of which is delimited by two through-openings 31 .

In the FIGS. 9a-9c and 10a-10b further variations with regard to the shape of the opening cross section of the through openings 61 are shown. These are constructed here from semicircles or full circles, with the through-openings 61 having a straight cylindrical shape defined by the cross-section of the opening. The passage openings 61 are also arranged in a honeycomb manner here. Here too, due to the cross-sectional shapes of the through-openings 61, receiving grooves 36 are provided, with the through-opening 61 being laterally convex in the delimitation of the receiving grooves 36 ( FIGS. 9a-9c ) or laterally concave ( FIG. 10a-10b ) bulge outwards.

In FIG. 11 the through-openings 61 have a square opening cross-section and are not arranged in a honeycomb-like overlapping manner with respect to the transverse direction, but lined up next to one another.

For example, if very large differences in the line cross-sections of the supply lines V have to be taken into account when determining, as in FIGS. 8a to 8c shown, additionally V-shaped incisions are made in the clamping surface 31 against the clamping direction k. Since these are several times larger than a receiving groove 36 described above in comparison to the size of the cross-sectional area of the through-openings 61 of the respective embodiment of the strain relief 1 , they are referred to here as a receiving channel 32 . These incisions are made along the flexible walls 52 of the delimiting through-openings 61 without opening any of the through-openings 61 laterally.

To reinforce proper support of the clamping parts 3 in the installed position in the clamping device 2, as exemplified in the embodiment of the strain relief 1 according to FIGS. 6a-6c shown, a mechanical connection provided in the holding area 34 is provided between the clamping parts 3 stacked against one another. The mechanical connection is designed here as a plug-in connection 8 with a plug-in projection 81 and plug-in opening 82 that are adapted to one another. In this case, the plug-in projection 81 of a clamping part 3 extends in the installed position in the clamping direction k and positively engages in the clamping direction k in the plug-in opening 82 assigned to it in the clamping part 3 adjacent to the clamping part 3 in the clamping direction k.

The strain relief 1 is part of an in FIG. 2a and 2 B End attachment part 9 shown. For connection to the supply line device, the end attachment part 9 has a connecting connection 91 which, as in the embodiment shown, is designed for supply line devices known per se made of chain links with side straps. Therefore, two terminal side tabs 92 matching the side tabs and defining the outside are provided. Since these connection side tabs 92 are adapted and therefore also have other shapes than those in FIG. 2 B may have the form shown, the external sign is the FIG. 2c Visible connection side flap 92 drawn with the omission of internal contours.

FIGS.12a-12b show a particularly preferred embodiment of a clamping part 300, which has a geometry of the cavity structure 6 and an outer elastic wall 50 with a corrugated profile, similar to that in FIG FIGS.6a-6d Has. The inner walls 52 in particular here also run in an arc or curve in the h,k plane. The through openings 61 of the clamping part 300 after FIGS.12a-12b are between two pairs of inner walls 52, however, widened to the indentations or receiving grooves 36 of the outer wall 50 with the clamping surface 31 and tapered to a central cross brace 7, into which the inner walls merge. The cross brace 7 runs centrally in the main plane of the clamping part 300 and forms the plane of symmetry of the mirror-symmetrical walls 50, 52 or cavity structures 6 on both sides. The outer walls 50 also form a clamping surface 31 for clamping supply lines for the purpose of strain relief in the longitudinal direction l.

Here, too, a number of inner elastic walls 52, which are produced monolithically or in one piece with the first elastic wall 50, similar to cell walls, form the honeycomb cavity structure 6, which is open on both front sides, in particular with completely continuous through openings 61.

The clamping part 300 has how FIG.12b visible on its two opposite narrow sides, which are approximately perpendicular to the outer walls 50, or at the top and bottom, two each Projections 323 or a recess 324 for form-fitting mounting in frame parts of a clamping device 302 ( FIG.13 ) or transverse webs 41 is provided, which in the clamping direction k that is transverse to the longitudinal direction l.

FIG.13 illustrates the use of several vertically arranged clamping parts 300 in a strain relief for several supply lines on an energy guiding chain. The strain relief off FIG.13 comprises a clamping device 302 with several frame parts and a quick-release fastener, with regard to the design of the teaching DE 20 2017 102 147 is expressly included here for brevity. The clamping parts 300 are held with the projections 323 or depressions 324 in a form-fitting manner in the profile-like transverse webs 41 of the clamping device 302 in the longitudinal direction l. Lines can easily be removed from above and inserted between two clamping parts 300 in each case.

FIG.14 Figure 4 illustrates the multi-piece housing 400 of a rectangular connector with multiple plug inserts to which various leads are terminated (not shown here). The strain relief takes place in the interior of the housing 400 facing away from the plug inserts by two clamping parts 3 arranged opposite one another; 300, eg according to FIGS.12a-12b or FIGS.6a-6d , which are arranged here horizontally in the housing 400 and only indicated schematically.

Reference List

1;1"

strain relief

2;2"

clamping device

3; 3"; 300

clamping part

31; 31"

clamping surface

32; 32"

intake channel

33

clamping section

34

holding area

35

clamping area

36

recording groove

4; 4"

recording frame

41; 41"

cross bar

50

outer wall (with clamping surface)

52

inner wall

54

node line

6

cavity structure

61

passage opening

62

apex edge

63

side face

7

cross bracing

71

cross bar

72

thickening

8th

connector

81

plug-in projection

82

plug opening

9

end fastener

91

connection port

92

connector side tab

302

clamping device

323; 324

bracket

400

connector housing

401

connector insert

H

height direction

k

clamping direction

l

longitudinal direction

q

transverse direction

V

supply line

Claims (17)

1. Clamping part (3; 3") for a clamping device (2; 2") of a strain relief device (1; 1") for supply lines (V) of a supply line device, wherein the strain relief device (1; 1") is designed to pass through the supply lines (V) in a longitudinal direction (1);
   the clamping part (3; 3") being block-like and having a side surface (63) designed as a clamping surface (31; 31") for clamping the supply lines (V) in a clamping direction (k) perpendicular or approximately perpendicular to the longitudinal direction (1) against a further clamping surface (31; 31") of the clamping device (2; 2"), the clamping surface (31) being formed by an elastic wall (50) at least in a clamping section (33) provided for clamping the supply lines (V), the elastic wall (50) delimiting, on the side facing away from the clamping surface (31), a cavity structure (6) extending in or approximately in the longitudinal direction (1) through the clamping part (3), the cavity structure (6) being defined by a plurality of through openings (61) extending in the longitudinal direction (1), at least some of which are bounded by the elastic wall (50), a plurality of through openings (61) of the cavity structure (6) being adjacent one another via further inner elastic walls (52).
2. Clamping part (3; 3") according to claim 1, characterized in that the wall thickness of the elastic wall (50) or the elastic walls (52) is less than/equal to one third of the average diameter, less than/equal to one eighth of the average diameter or less than/equal to one tenth in each case of the average diameter of the adjacent through openings (61) .
3. Clamping part (3; 3") according to any one of claims 1 to 2, characterized in that at least the through openings (61) assigned to the clamping surface (31) are congruent, the through openings (61) preferably each having the shape of a straight prism, in particular the through openings (61) being arranged in a honeycomb-like manner in at least two rows parallel to one another.
4. Clamping part (3; 3") according to any one of claims 1 to 3, in particular according to claim 3, characterized in that the through openings (61) have the shape of a straight prism with an approximately triangular base surface and with apex edges (62), the triangle of the base surface being arranged with a tip pointing in the clamping direction (k) in the case of one group of through openings (61) and with a tip pointing in the clamping direction (k) in the case of another group of through openings (61), wherein in particular the through openings (61) of the one group are in each case bounded by the elastic wall (50) with the clamping surface (31) with the tip pointing against the clamping direction (k), wherein preferably with respect to a direction perpendicular to the longitudinal direction (1) and clamping direction (k) the through openings (61) of the one group are arranged alternately to the through openings (61) of the other group and/or in alignment with each other regarding the direction.
5. Clamping part (3; 3") according to any one of claims 1 to 4, characterized in that a transverse strut (7) extending over the length of the clamping part (3) and perpendicular to the longitudinal direction (1) and clamping direction (k) is provided in a central region with respect to the longitudinal direction (1) and/or in that a transverse strut extending over the length of the clamping part (3) and in the clamping direction (k) is provided in a central and/or end region with respect to a direction perpendicular to the longitudinal direction (1) and clamping direction (k).
6. Clamping part (3; 3") according to any one of claims 1 to 5, characterized in that the clamping part (3) has a further clamping surface (31) which is arranged facing away from the one clamping surface (31) of the clamping part (3) on the same, the clamping part (3) preferably being of mirror-symmetrical design with respect to a main axis.
7. Clamping part (3; 3") according to any one of claims 1 to 6, characterized in that the cavity structure (6) has a plurality of, in particular at least eighteen, through openings (61) delimited by elastic walls (50; 52), the through openings (61) being arranged in at least two rows which each run in a transverse direction (q) transverse to the longitudinal direction (1) and transverse to the clamping direction (k) and/or the average diameter of the through openings (61) being smaller than 50% of the dimension of the clamping part in the clamping direction (k).
8. Clamping part (3; 300) according to claim 1, wherein the clamping part is manufactured in one piece from an elastic plastic material and has two opposing side surfaces (63) that each comprise a clamping surface (31) for clamping at least one supply line (V) in a clamping direction (k) against a further clamping surface (31; 31"), wherein the further elastic walls (52) have a grid-like arrangement.
9. Clamping part (3; 300) according to claim 8, characterized in that the clamping part is designed mirror-symmetrically with respect to a main plane perpendicular to the clamping direction (k) and/or has a transverse strut (7) in the main plane which extends over a main dimension and is integrally connected to the grid-like arrangement of the walls (52).
10. Clamping part (3; 300) according to claim 8 or 9, characterized in that the through openings (61) extend at least predominantly or completely continuously in or approximately in the longitudinal direction (1) through the clamping part (3), the cavity structure (6) being of honeycomb design and the elastic walls (50; 52) forming cell walls which delimit the through openings (61) perpendicular to the longitudinal direction (1).
11. Clamping part (3; 300) according to any one of claims 8, 9 or 10, characterized in that the grid-like arrangement comprises walls (52) arranged in pairs, wherein opposite walls (52) in each pair are each bent in opposite directions, preferably with an intermediate through opening (61) which has a cross-sectional shape tapering away from the elastic wall (50), wherein in particular the walls (52) in each pair merge integrally into the transverse strut (7) at the end region facing away from the clamping surface (31).
12. Clamping part (3; 300) according to any one of claims 8 to 11, characterized in that at least one projection (323) and/or one recess (324) is provided in each case on two opposite narrow sides of the clamping part which are perpendicular to the side faces (62), for positive retention in a frame, the projection and/or the recess preferably running in the clamping direction (k) or transversely to the longitudinal direction (1).
13. Clamping part (3; 300) according to any one of claims 8 to 12, characterized in that the cavity structure (6) has a plurality, in particular at least eighteen, through openings (61) delimited by elastic walls (50; 52), the through openings (61) preferably being arranged in at least two rows, each of which runs in a transverse direction (q) transverse to the longitudinal direction (1) and transverse to the clamping direction (k), and/or the average diameter of the through openings (61) being smaller than 50% of the dimensions of the clamping part in the clamping direction (k) .
14. Strain relief device (1; 1") for supply lines (V) of a supply line device, wherein the strain relief device comprises a clamping device (2; 2") with at least one clamping part according to any of claims 1 to 13.
15. Strain relief device (1; 1") according to claim 14, characterized in that at least one further clamping part (3) of identical construction is provided, the two clamping parts (3) being arranged with their clamping surfaces (31) opposite one another in the installation position in the strain relief device (1).
16. End fixing part (9) for an energy guiding chain, wherein the end fixing part has a strain relief device (1) according to any one of claims 14 to 15, wherein a number of clamping parts are held in a frame, preferably in an orientation with clamping surfaces (31) extending substantially perpendicular to the clamping direction, wherein the end fixing part for connection to the energy guiding chain comprises a connection link (91) such as two side parts, and particularly in the case of a supply line device made of chain links with side plates, two connection side plates (92) adapted to said side plates.
17. Energy guiding chain with a strain relief device according to any one of claims 14 to 15.

Images